1. Check whether the SIM card has a locked PIN (can be viewed on the mobile phone);
2. Check whether it is necessary to set the corresponding APN (the one who sells the card knows the APN);
3. Check whether the SIM card is a directional traffic card. If it is a directional traffic card, you need to bind the IP of our server-related domain name (contact the manufacturer).
                                         
                 
                         
                             
                        
 
                 
                                             
                                        









 
    
 
            
        
         
    
             
            
        
         
    
    